Yes I know, I keep mentioning that because its the closest on Noogle gauge which is easiest to read, secondly I keep mentioning to pump below this pressure, notch or two less on the gauge, its easily enough. I have never used other gauge which might have different markings on it, these two are very close to each other on the Noogle gauge.

Better just mention inHg I guess so there's no need to split hairs.